Violence has erupted in Hamburg as police clashed with anti-capitalism protesters ahead of the G20 summit in Germany's second largest city.

Police used water cannons, batons and pepper spray to disperse the demonstrators as Donald Trump, Theresa May and other leaders from the world's leading economic powers were arriving for the two-day gathering.

Arriving in Hamburg, Mrs May said she would be urging China - whose President Xi Jinping is also attending - to play a greater role in halting North Korea's missile programme.

Police officers are silhouetted by fires lit by demonstrators during a protest against the G-20 summit in Hamburg, northern Germany (Image: AP Photo/Markus Schreiber)

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